That's awesome! I don't think I've seen that level of tracking and freedom in a VR experience video. There are things like "The Void" but they seem to focus more on real world objects providing feedback or regular motion controls. I would love to try this experience if it ever comes to my area of the US...would love to help bring something like that here really. That's the kind of futuristic VR that I dreamed about when I was so pumped for things like the original Vive, Magic Leap, Virtuix Omni, etc.
I've dreamed about a using VR on a scale even larger than that experience for a while now but understand it's not feasible in the near future. When I mentioned the paintball match size before, I'm thinking of an indoor/outdoor modular arena that can be mapped and manipulated for various VR game modes. So for instance you could have an FPS game where players get guns and simulate an airsoft/paintball match in a fantasy realm (think Pavlov but actually being able to move around the world with real time tracking). You could setup LARP events with real magic and swords/shields/arrows/etc. with kingdoms/castles (even buildable to an extent). You could setup obstacle courses that look like players are walking over a tight rope or through fire...so many options.
I obviously don't know how you'd manage or track it at that scale; (as you know) I'm sure it would require a very intensive and low latency backend. My guess is you would have to have a defined area and tons of tracking points like the current experiences or perhaps even drones that are constantly patrolling and tracking positions of both the field and players in real time combined with feedback from the player's devices themselves.
Well that's it for my daydream rambling, love what you guys are doing and can't wait to see how it develops further in the future.